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2015 Jul 02
2
[LLVMdev] [x86] Compiling in 32-bit mode causes 64-bit asm source to be silently converted to its 32-bit equavilent
Hi Craig,
I am Charles Li from Sony Playstation.
We are doing x86 code gen testing and, by chance, we noticed that compiling the 64-bit assembly instruction<https://msdn.microsoft.com/en-us/library/windows/hardware/ff561499(v=vs.85).aspx> "jrcxz" in 32-bit mode "-m32"
previously resulted in an error,
now gets silently converted into the 32-bit equivalent instruction "jecxz".
I have bisected this change in behavior down to r225075 - [X86] Make the instructions that use AdSize16/32/64 co...